fix: full-repo ruff lint cleanup and CI migration to uv

Resolve all 374 ruff errors across 36 Python files (E501, E702, E722,
E741, F821, F841, invalid-syntax) bringing `ruff check .` to zero
errors repo-wide with line-length=100.

Rewrite CI workflow to use uv for dependency management, whole-repo
`ruff check .`, py_compile syntax gate, and merged python-tests job.
Add pyproject.toml with ruff config and uv dependency groups.

CI structure proposed by hcm444.

pyproject.toml

@@ -0,0 +1,27 @@
+[project]
+name = "aeris-10-radar"
+version = "1.0.0"
+description = "AERIS-10 FMCW Radar Platform — host software & FPGA cosim tools"
+requires-python = ">=3.12"
+
+# Runtime dependencies intentionally empty — GUI deps are optional and
+# listed in requirements_*.txt files for local installs.
+dependencies = []
+
+[dependency-groups]
+dev = [
+    "ruff>=0.5",
+    "pytest>=8",
+    "numpy>=1.26",
+    "h5py>=3.10",
+]
+
+# ---------------------------------------------------------------------------
+# Ruff configuration
+# ---------------------------------------------------------------------------
+[tool.ruff]
+target-version = "py312"
+line-length = 100
+
+[tool.ruff.lint]
+select = ["E", "F"]